.page-about {
  --stage-1: #C3CCD2;
  --stage-2: #8A7BE0;
  --stage-3: #2FE9C6;
  --stage-4: #FF7A2F;
  display: block;
  background: var(--c-ink);
  color: var(--txt);
  font-family: var(--font-body);
  font-size: var(--fs-16);
  line-height: 1.75;
  overflow-x: hidden;
}

.page-about .breadcrumb {
  padding-top: 20px;
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  padding: 24px 0 48px;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -80px;
  right: -10%;
  width: 60%;
  height: 320px;
  background: radial-gradient(ellipse at center, rgba(47, 233, 198, 0.12), transparent 68%);
  pointer-events: none;
}

.page-about .about-hero-grid {
  position: relative;
  display: grid;
  gap: 36px;
  align-items: start;
}

.page-about .about-hero h1 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(32px, 6.6vw, 60px);
  line-height: 1.05;
  letter-spacing: -0.01em;
  margin: 12px 0 18px;
  color: var(--c-mist);
}

.page-about .about-hero .lede {
  max-width: 60ch;
  margin: 0;
  color: var(--txt-dim);
}

.page-about .about-hero-stats {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 32px 0 0;
  padding: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.page-about .about-hero-stats li {
  background: linear-gradient(180deg, rgba(13, 42, 33, 0.95), rgba(6, 18, 14, 0.95));
  padding: 14px 16px 16px;
}

.page-about .about-stat-num {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: var(--fs-28);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.01em;
  color: var(--c-cyan);
}

.page-about .about-stat-key {
  display: block;
  margin-top: 4px;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.08em;
  color: var(--txt-faint);
}

.page-about .about-hero-visual {
  position: relative;
  overflow: hidden;
  padding: 20px 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background-image:
    repeating-linear-gradient(0deg, rgba(195, 204, 210, 0.055) 0 1px, transparent 1px 28px),
    repeating-linear-gradient(90deg, rgba(195, 204, 210, 0.055) 0 1px, transparent 1px 28px),
    linear-gradient(160deg, rgba(13, 42, 33, 0.9), rgba(6, 18, 14, 0.96));
}

.page-about .about-hero-visual::after {
  content: "";
  position: absolute;
  top: -30%;
  right: -18%;
  width: 70%;
  height: 70%;
  background: radial-gradient(circle at center, rgba(47, 233, 198, 0.16), transparent 68%);
  pointer-events: none;
}

.page-about .about-axis {
  position: relative;
  z-index: 1;
  display: block;
  width: 100%;
  max-width: 440px;
  height: auto;
  margin-inline: auto;
}

/* ---------- 通用分节 ---------- */

.page-about .about-section {
  padding: 52px 0;
  border-top: 1px solid var(--line-soft);
}

.page-about .about-section-head {
  max-width: 64ch;
  margin-bottom: 34px;
}

.page-about .about-section-head h2,
.page-about .about-origin-copy h2,
.page-about .about-team-copy h2,
.page-about .about-network-copy h2 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(26px, 4.6vw, 42px);
  line-height: 1.12;
  letter-spacing: -0.01em;
  margin: 10px 0 14px;
  color: var(--c-mist);
}

.page-about .about-section-lede {
  margin: 0;
  max-width: 60ch;
  color: var(--txt-dim);
}

.page-about .about-figure {
  margin: 0;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--c-char);
}

.page-about .about-figure figcaption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  line-height: 1.7;
  letter-spacing: 0.04em;
  color: var(--txt-faint);
}

/* ---------- 起点 ---------- */

.page-about .about-origin {
  border-top: 0;
}

.page-about .about-origin-grid {
  display: grid;
  gap: 32px;
}

.page-about .about-origin-copy p {
  margin: 0 0 16px;
  max-width: 62ch;
  color: var(--txt-dim);
}

.page-about .about-origin-note {
  margin: 22px 0 0;
  padding-left: 14px;
  border-left: 2px solid var(--c-cyan);
  font-family: var(--font-mono);
  font-size: var(--fs-13);
  line-height: 1.85;
  letter-spacing: 0.02em;
  color: var(--txt-dim);
}

/* ---------- 版本时间线 ---------- */

.page-about .about-timeline {
  border-top: 1px solid var(--line);
}

.page-about .about-stage {
  display: block;
  padding: 26px 0 28px;
  border-bottom: 1px solid var(--line);
}

.page-about .about-stage[data-stage="v1"] { --stage: var(--stage-1); }
.page-about .about-stage[data-stage="v2"] { --stage: var(--stage-2); }
.page-about .about-stage[data-stage="v3"] { --stage: var(--stage-3); }
.page-about .about-stage[data-stage="v4"] { --stage: var(--stage-4); }

.page-about .about-stage-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin-bottom: 14px;
}

.page-about .about-stage-year {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: var(--fs-28);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--c-mist);
}

.page-about .about-stage-ver {
  padding: 3px 8px;
  border: 1px solid currentColor;
  border-radius: var(--radius);
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  line-height: 1.3;
  letter-spacing: 0.1em;
  color: var(--stage);
}

.page-about .about-stage-name {
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.1em;
  color: var(--txt-faint);
}

.page-about .about-stage-title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(20px, 2.8vw, 26px);
  line-height: 1.25;
  margin: 0 0 10px;
  color: var(--c-mist);
}

.page-about .about-stage-summary {
  margin: 0;
  max-width: 62ch;
  color: var(--txt-dim);
}

.page-about .about-stage-more {
  margin-top: 16px;
  padding-top: 12px;
  border-top: 1px dashed var(--line-soft);
}

.page-about .about-stage-more > summary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-mono);
  font-size: var(--fs-13);
  letter-spacing: 0.06em;
  color: var(--c-cyan);
}

.page-about .about-stage-more > summary::-webkit-details-marker {
  display: none;
}

.page-about .about-stage-more > summary::before {
  content: "+";
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 16px;
  height: 16px;
  border: 1px solid currentColor;
  border-radius: var(--radius);
  font-size: 13px;
  line-height: 1;
}

.page-about .about-stage-more[open] > summary::before {
  content: "−";
}

.page-about .about-stage-facts {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px 20px;
  margin: 16px 0 0;
}

.page-about .about-stage-facts dt {
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.08em;
  color: var(--stage);
}

.page-about .about-stage-facts dd {
  margin: 0;
  max-width: 62ch;
  color: var(--txt-dim);
}

/* ---------- 团队 ---------- */

.page-about .about-team-grid {
  display: grid;
  gap: 32px;
  align-items: start;
}

.page-about .about-team-copy p {
  margin: 0 0 16px;
  max-width: 62ch;
  color: var(--txt-dim);
}

.page-about .about-team-facts {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-about .about-team-facts li {
  display: grid;
  grid-template-columns: 92px minmax(0, 1fr);
  align-items: baseline;
  gap: 16px;
  padding: 12px 0;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-team-num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: var(--fs-28);
  font-weight: 700;
  line-height: 1;
  color: var(--c-orange);
}

.page-about .about-team-key {
  font-size: var(--fs-13);
  letter-spacing: 0.04em;
  color: var(--txt-dim);
}

/* ---------- 本地内容网络 ---------- */

.page-about .about-network-grid {
  display: grid;
  gap: 32px;
  align-items: start;
}

.page-about .about-network-copy p {
  margin: 0 0 16px;
  max-width: 62ch;
  color: var(--txt-dim);
}

/* ---------- 长期做法 ---------- */

.page-about .about-principles-list {
  list-style: none;
  display: grid;
  gap: 1px;
  margin: 0;
  padding: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.page-about .about-principle {
  position: relative;
  padding: 28px 22px 30px;
  background: var(--c-ink);
}

.page-about .about-principle::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--principle-accent, var(--c-cyan));
}

.page-about .about-principle:nth-child(1) { --principle-accent: var(--c-cyan); }
.page-about .about-principle:nth-child(2) { --principle-accent: var(--stage-2); }
.page-about .about-principle:nth-child(3) { --principle-accent: var(--c-orange); }

.page-about .about-principle-num {
  display: block;
  margin-bottom: 14px;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.16em;
  color: var(--principle-accent, var(--c-cyan));
}

.page-about .about-principle h3 {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: var(--fs-20);
  line-height: 1.3;
  color: var(--c-mist);
}

.page-about .about-principle p {
  margin: 0;
  color: var(--txt-dim);
}

/* ---------- 结尾入口 ---------- */

.page-about .about-cta {
  padding: 48px 0 56px;
  border-top: 1px solid var(--line);
  background-image:
    linear-gradient(118deg, rgba(75, 63, 150, 0.3), rgba(17, 20, 23, 0.96) 58%),
    linear-gradient(0deg, var(--c-char), var(--c-char));
}

.page-about .about-cta-inner {
  display: grid;
  gap: 24px;
}

.page-about .about-cta h2 {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(22px, 3.4vw, 32px);
  line-height: 1.2;
  color: var(--c-mist);
}

.page-about .about-cta p {
  margin: 0;
  max-width: 58ch;
  color: var(--txt-dim);
}

.page-about .about-cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 响应式 ---------- */

@media (min-width: 700px) {
  .page-about .about-stage-facts {
    grid-template-columns: 96px minmax(0, 1fr);
  }

  .page-about .about-hero-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 880px) {
  .page-about .about-section {
    padding: 76px 0;
  }

  .page-about .about-cta {
    padding: 60px 0 68px;
  }

  .page-about .about-cta-inner {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 44px;
  }

  .page-about .about-stage {
    display: grid;
    grid-template-columns: 196px minmax(0, 1fr);
    padding: 0;
  }

  .page-about .about-stage-meta {
    position: relative;
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
    margin: 0;
    padding: 34px 32px 34px 0;
    border-right: 1px solid var(--line);
  }

  .page-about .about-stage-meta::after {
    content: "";
    position: absolute;
    top: 48px;
    right: -1px;
    width: 20px;
    height: 2px;
    background: var(--stage);
    box-shadow: 0 0 10px var(--stage);
  }

  .page-about .about-stage-main {
    padding: 34px 0 36px 36px;
  }

  .page-about .about-principles-list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 920px) {
  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 1.06fr) minmax(0, 0.94fr);
    gap: 56px;
    align-items: center;
  }

  .page-about .about-origin-grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    gap: 56px;
  }

  .page-about .about-origin-copy {
    order: 1;
  }

  .page-about .about-team-grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    gap: 56px;
  }

  .page-about .about-network-grid {
    grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
    gap: 56px;
  }
}
<<<END>>>